The GNUstep extensions library version 0.8.6 has been put at 

ftp://ftp.gnustep.org/pub/gnustep/libs

There is only one minor bug fix in this release, to match the change in
ivar names with NSExtensions.

README:

This library contains some classes that extend the basic behavior of
Foundation classes by adding some features. The current extensions are
an
extended exception handling mechanism, a garbage collector, some classes
that allow you to easily create methods that accept printf-like
arguments.

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